Carburetor



June 24-, 1941.

C. DE GUYON CARBURETOR I Filed July 23, 1940 5 Sheets-Sheet l In ven tor(Yemen/ flak Va A iiorne y June 24, 1941. c, DE GUYON CARBUREIOR 3Sheets-Sheet 2 Filed July 25, 1940 Inventor k I 0 0/0/&(o Ma Aiipfney IJune 24, 1941. c. DE GUYON CARBURETOR 3 Sheets-Sheet 3 Filed July 23.1940 In ventor Patented June 24, 1941 UNITED s'm'rss rarest enticeCAR/BURETOR Clement dc Guyon, Hartford, Conn.

Application July 23, 1940, Serial No. 347,073

1 Claim.

This invention relates to carburetors for internal combustion engines,and has for the primary object the provision of a device of thischaracter which will admit fuel to an air and fuel mixing chamber by theopening and closing of the throttle valve so as to supply fuel mixtureto the engine to meet varying loads on said engine and will render theengine easy to start and eliminate customary choke valves, float valvesand associated parts now employed in carburetors used on engines.

With these and other objects in View as will become more apparent as thedescription proceeds, the invention consists in certain novel featuresof construction, combination and arrangement of parts as will behereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings, in which- Figure 1is a top plan view illustrating a carburetor constructed in accordancewith my invention.

Figure 2 is a vertical sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a sectional View taken on the line 33 of Figure 2.

Figure 4 is a top plan View illustrating a modified form of myinvention.

Figure 5 is a vertical sectional view taken on the line 55 of Figure 4.

Figure 6 is a sectional view taken on the line 66 of Figure 5.

Figure 7 is a detail transverse sectional view illustrating a meteringpin sleeve and its mounting within a metering pin cage.

Referring in detail to the drawings, the numeral 5 indicates the body ofthe carburetor composed of sections A and B. An external sleeve 6 isshrunk on the section A and has a telescopic fit with a portion of thesection B and is detachably secured thereto by fasteners l.

The section B has a portion thereof shaped to form a throat 8, flanged,as shown at 9, to permit coupling of the throat onto an intake manifoldof an internal combustion engine. A throttle valve l0 of the butterflyvalve type is journaled in the throat 8 and the shaft thereof isindicated by the character II. The shaft II is equipped with anoperating arm l2 and a stop means I3 for limiting the closing of thethrottle valve so that an engine may be kept running at idling speed.Also, the throttle Valve is equipped with ports 14 to permit sufficientfuel mixture to pass the throttle valve when the latter is in a closed.position to maintain the engine operating at idling speed.

It is to be understood that the'arm I2 is connected to the usualthrottle operating means for the carburetor.

The section B of the body 5 is further provided with a flared chamber 15coacting with a flared chamber it in the section A of the body indefining a combined air and fuel mixing chamber.

By referring to Figure 2 it will be seen that the flared chamber of thesection B leads into the throat 8 while the Walls of the chamber l6 ofthe section A of the body have a series of air ports I! connecting withan air chamber 18 formed in the section A of the body.

The section A of the body 5 has formed therein an annular recess closedby the sleeve 6 to form the air chamber it. The air chamber is incommunication with the atmosphere by way of a series of passages l9formed in the section A of the body 5 and opening outwardly through theupper end of the latter. By referring to Figure 1 it will be seen thatthese passages l9 may be of varying sizes.

The section A of the body 5 is recessed to form a nozzle chamber 28 inwhich is threaded a nozzle 2|. Interposed between the inner wall of thenozzle chamber and the nozzle 2| is a gasket 22, spacing the nozzle 2|2. limited distance away from the inner Wall of said nozzle chamber toform an air chamber connecting with an air passage 23 opening outwardlythrough one side of the section A and the sleeve 6 and in which isthreaded a conduit 24 employed for introducing air under pressure from aconventional type of air supercharger.

The nozzle 2! is recessed to form a dome shaped chamber 25 connectingwith the air and fuel mixing chamber. The chamber 25'is connected to theair chamber of the air supercharging passage 23 by ports 26 set at aninclination and converging towards each other where entering the chamber25 so that the air under pressure will be delivered in the chamber 25towards the center thereof.

The section A of the body 5 is provided With a metering pin chamber 21in which is mounted a sleeve 28 having a rounded closed end 29 seatedwithin a cup-shaped recess 30 formed centrally of the nozzle 2|. Therounded closed end 29 of the sleeve has a metering pin neck 3| whichextends through a centrally arranged port in the nozzle to deliver fuelinto the chamber 25 centrally thereof for mixing with the air receivedby way of the ports 26 and H. The neck 3| forms a seat for a meteringpin 33 slidably mounted within an inner sleeve 34 mounted in the sleeve28 and spaced therefrom by upper and lower collars 35 and 36. The lowercollar 36 has a series of notches 3! to permit fuel to pass the lowerflange and reach the neck 3| of the outer sleeve 28. It is to beunderstood that fuel under pressure is admitted to the outer sleeve bythe port 28!, the latter being connected to a feed pressure source (notshown) in any well known manner. The flange 35 is also provided withnotches to permit the fuel to pass down 7 between the sleeve 34 and thesleeve 28. The inner sleeve 34 projects above the. outer sleeve 28 andhas arranged between its upper end andthe metering pin chamber 27' apacking 38 through which the metering pin 33 extends The section A ofthe body 5 is recessed, as

shown at 39, to receive the upper end of the metering pin and in whichextends an operat ing lever pivoted on the sleeve 6', assh'own at 41.The sleeve 6 has a slot to permit" the lever 40 to extend therethrough.It is preferable that the lever be composedof sect-ions havingtelescopic fit with each other. One end of the lever 40- is pivoted tothe meteringpin and the other end is pivotally connected to anadjustable connecting link 42' which is inturn' pivotally connected ontoan arm 44 forming an integral part of the operating arm 21' of thethrottle valve so that as the throttle valve is. moved away from aclosed position, the metering pin also will be moved away from its seatto'admitfuel to the air and fuelimixing chamber and as the airpas-ses'into said chamber from all s-id'es-and the fuel centrally thereof, thefuel and air will become thoroughly mixed and rendered volatile toprovide proper fuelmixture for theengine.

Asin'dicated at 4'5; fuelis'forcediinto the meteringpin chamber 21'under" pressure. It will be seen that the construction of carburetordescribed willeliminate the use of a choke and. also a float valve andassociated'parts. and. that the fuel will'be proportionately admitted.to the mixing chamber as the throttle valve is. movedtowards open and"closed positions.

Referring. to my modified form of'my invention, the body of thecarburetor is indicated-by the character 46an-d is composedoffdetachably connected sections C" and D andth'e section-Disconstrueted'similarly to the section- Bflofi the body 5, the throttlevalve being indicated'by thecha-racter '41? Also it will be noted thatthe sec-- tions" Can'd D" are detachably connected in the same manner asthe sections'A and B The. section 0 has a metering pinv chamber 48fediwith fuel by way of the. passage ili,v it beingunderstoodithat fuelis fedinto the meter.- in'g; chamber under pressure. Also, it willbeseen that the chamber dB -is provided with the metering, pin sleeves2B and 36 andthe metering pin 33'; It is to be notedthat. the-meter--ing pin in either form of the carburetor is urged* into. seated.position by the ac'tion-of a co-ilwspring 49, The connection: betweenthemeterin'gfpin': 33 of my; modified form of thein'vention'witm the.throttle valve is similar to the connection provided inthe form of my'inventi-on shown in Figures 1 and 2 and it is, therefore, not thoughtnecessary to again describe this construction in detail.

The section C of the body 66 is provided with a comparatively largerecess in which is threaded a nozzle 50 having a gasket 5| interposedbetween itself and the inner wall of the recess. Between the nozzle andthe body is defined an air chamber 52 fed with atmospheric air by way ofpassages 53' opening outwardly through the upper endof these'ction C of"the body 46. The nozzle 50 is provided with a dome-shaped portion 52coactin-g with the flared recess 53 in the section D in forming the airand fuel mixing chamber. The dome-shaped portion of the nozzle hasformed therein a series of ports 54 connecting with the air chamber 52.It will thereforeb'e seen that the air is admitted into the air and?fuel mixing chamber in converging relation and towards the center ofsaid chamber. Also it will be noted that in this form of theinventionthe fuel is admitted to the dome of the nozzle centrally of thedome portionso' that fuel willbe' delivered axiallyof the air'and fuelmixmg chamber with" the incoming" air converging from all sides of theflow of fuel and thereby bring about a rapid and thorough commingling ofthe a-ir'and f'uel'to produce a desiredfuelmixture. for an engine; 30

are unnecessary and that the engine will receive 35' fuel mixture inaccordanc'e'with its loads.

While I have shown and described the preferred embodiment ofmy'invention, it willbe understood that minor changes in construction,combination and arrangement of parts may. be made without departing'fromthe spirit and'scope of the invention as claimed.

Having. thus. described the invention, what I claim is: I v

In a carbureto-r,.-a body including recessed-separable upper and lowersections arranged in'ver tical endwise relation and coacting to providea mixing'chamber and a throat withthe mixing chamber extending into bothof said sections, the upper section having an air chamber a ecu-- plingsleeve detachably' joining said' sections, means for admit-ting airtothe air chamber, a throttle valve for controlling the throat, anannular member" threaded in and located at the upper end of themixingchamber and 'including a substantially dome-shaped portion havingacentrally arranged opening" and" a plurality'of ports grouped annularlyabout the" opening. and connecting theair chamber to the mixing chamher"for" directing air into said mixing chamber axially thereof, saiddome-shaped portion hav ing -a seat in theupperfaoe'thereofj a fuelsleeve mounted inthe upper section and having arounded endengagingthesea't andprovided with an outlet neck extending through'the openingand providing a valve seat;- means for admitting liq uid fuel to saidfuel sleeve, and a spring influenced. metering pinconnected toandoperatedby the throttle val'veand supported in the sleeve" for coac-tionwith the valve seat to cont-rolliquid fuel into the mixing chamberaxially thereofi GLEMENT- DE GUYON?

